This study provides the first quasi-experimental evidence on the effects of non-binding vaccine recommendations targeted at high school-aged adolescents. I find that these simple recommendations significantly increased meningococcal vaccination rates among the targeted population by 21 percentage points, or 133% relative to the baseline mean, and substantially reduced meningococcal disease incidence in the population. I also provide evidence that the recommendations primarily affected vaccination rates through changes in provider behavior, and show that they exacerbated pre-existing disparities in receipt of preventive care. In particular, lower SES groups, which had lower rates of vaccination and provider contact prior to the recommendation, were also less responsive to the policy.